Every purchase you make from a foreign merchant (including online sellers that use an overseas payment network) is subject to two extra fees: foreign transaction and currency conversion fees.

每次你在国外买点什么的时候(包括网上那些使用跨国付费系统的卖家们)，你都要考虑到有两种额外的费用是你要支付的：外国交易费和货币兑换费。

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Capital One is well known for not charging any foreign transaction fees on their cards.

FORBES: How Foreign Transaction Fees Cost You

Capital One was the first bank to issue credit cards without foreign transaction fees.

BBC: Paying the price for foreign transactions

For example, while my Amex charges 2.7%, the Platinum Card from Amex has no foreign transaction fees.

FORBES: Best Credit Cards for International Travel?